Spring配置连接池

转自：http://conect.iteye.com/blog/198826

Spring 配置proxool连接池

在我的工程中，文件名叫hibernate.cfg.xml，和entity放在一起

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:tx="http://www.springframework.org/schema/tx"
 xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">

 <bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource" destroy-method="close">
  <property name="driver" value="${hibernate.driverClass}" />

或者直接写成<property name="driver">               <value>com.mysql.jdbc.Driver</value></property>
  <property name="driverUrl" value="${hibernate.jbdc.url}" />
  <property name="user" value="${hibernate.jbdc.user}" />
  <property name="password" value="${hibernate.jdbc.password}" />

<!-- <alias>是连接池的别名，proxoolPool连接池的一种，此外经常使用的连接池还有C3P0 -->
  <property name="alias" value="proxoolPool" />

<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回

           收,超时的销毁 （默认30秒）-->
  <property name="houseKeepingSleepTime" value="30000" />

<!-- 最少保持的空闲连接数 （默认5个）-->
  <property name="prototypeCount" value="20" />

<!-- 设置连接池内生成的最大连接数/在连接池中所有数据库连接的最大数目（默认15个） -->
  <property name="maximumConnectionCount" value="${hibernate.jdbc.maxConn}" />

<!-- 设置连接池内生成的最小连接数/在连接池中可用的数据库连接的最少数目（默认5个）-->
  <property name="minimumConnectionCount" value="${hibernate.jdbc.minConn}" />

<!-- 在Consonl中显示sql -->
  <property name="trace" value="true" />
  <property name="verbose" value="true" />
 </bean>

 <bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
  <property name="dataSource" ref="dataSource" />
  <property name="schemaUpdate" value="${hibernate.schemaUpdate}" />
  <property name="hibernateProperties">
   <props>
    <prop key="hibernate.dialect">${hibernate.dialect}</prop>
    <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
    <prop key="hibernate.format_sql">true</prop>
    <prop key="hibernate.use_outer_join">true</prop>
    <prop key="hibernate.jdbc.fetch_size">50</prop>
    <prop key="hibernate.jdbc.use_streams_for_binary">true</prop>
    <prop key="hibernate.bytecode.use_reflection_optimizer">true</prop>
    <prop key="hibernate.query.substitutions">true 1,false 0,yes 'Y',no 'N'</prop>
   </props>
  </property>
  <property name="annotatedClasses">
   <list>
    <value>com.mysteel.entity.xxx</value>
   </list>
  </property>
 </bean>

 <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
  <property name="sessionFactory" ref="sessionFactory" />
 </bean>

</beans>

第二个bean即从
<bean：id="sessionFactory"...>到</bean>是因为使用  Spring 框架，可以使用 AnnotationSessionFactoryBean
类轻松建立一个基于注释的 Hibernate 会话工厂

<!-- SessionFactory:使用AnnotationSessionFactoryBean可以直接在 Spring中配置一个SessionFactory,而不必使用Hibernate特有的hibernate.cfg.xml配置文件。 -->

Spring配C3P0连接池

applicationContext.xml 文件：

<? xml version = "1.0" encoding = "UTF-8" ?>

< beans xmlns = "http://www.springframework.org/schema/beans"

    xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"

    xmlns:jee = "http://www.springframework.org/schema/jee"

    xsi:schemaLocation = "http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd

            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd" >

    < bean id = "dataSource"

        class = "com.mchange.v2.c3p0.ComboPooledDataSource"

        destroy-method = "close" >

        < property name = "driverclass " >

            < value > com.mysql.jdbc.Driver </ value >

        </ property >

        < property name = "jdbcUrl " >

            < value > jdbc:mysql://192.168.3.110:3306/DBName?useUnicode=true &amp; characterEncoding=GBK </ value >

        </ property >

        < property name = "user " >

            < value > root </ value >

        </ property >

        < property name = "password" >

            < value > root </ value >

        </ property >

 

 <!--连接池中保留的最小连接数。-->

        < property name = "minPoolSize" >

            < value > 5 </ value >

        </ property >

 

 <!--连接池中保留的最大连接数。Default: 15 -->

        < property name = "maxPoolSize" >

            < value > 30 </ value >

        </ property >

 

<!--初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3 -->

        < property name = "initialPoolSize" >

            < value > 10 </ value >

        </ property >

 

 <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->

        < property name = "maxIdleTime" >

            < value > 60 </ value >

        </ property >

 

 <!--当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3 -->

        < property name = "acquireIncrement" >

            < value > 5 </ value >

        </ property >

 

 <!--JDBC的标准参数，用以控制数据源内加载的PreparedStatements数量。但由于预缓存的statements
  属于单个connection而不是整个连接池。所以设置这个参数需要考虑到多方面的因素。
  如果maxStatements与maxStatementsPerConnection均为0，则缓存被关闭。Default: 0-->

        < property name = "maxStatements" >

            < value > 0 </ value >

        </ property >

 

 <!--每60秒检查所有连接池中的空闲连接。Default: 0 -->

        < property name = "idleConnectionTestPeriod" >

            < value >6 0 </ value >

        </ property >

 

 <!--定义在从数据库获取新连接失败后重复尝试的次数。Default: 30 -->

        < property name = "acquireRetryAttempts" >

            < value > 30 </ value >

        </ property >

 

 <!--获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效
  保留，并在下次调用getConnection()的时候继续尝试获取连接。如果设为true，那么在尝试
  获取连接失败后该数据源将申明已断开并永久关闭。Default: false-->

        < property name = "breakAfterAcquireFailure" >

            < value > true </ value >

        </ property >

 

 <!--因性能消耗大请只在需要的时候使用它。如果设为true那么在每个connection提交的
  时候都将校验其有效性。建议使用idleConnectionTestPeriod或automaticTestTable
  等方法来提升连接测试的性能。Default: false -->

        < property name = "testConnectionOnCheckout" >

            < value > false </ value >

        </ property >

    </ bean >

    <!-- Hibernate SessionFactory -->

    < bean id = "sessionFactory"

        class = "org.springframework.orm.hibernate3.LocalSessionFactoryBean" >

        < property name = "dataSource" >

            < ref local = "dataSource" />

        </ property >

        < property name = "mappingResources" >

            < list >

                < value > com/xh/hibernate/vo/User.hbm.xml </ value >

            </ list >

        </ property >

        < property name = "hibernateProperties" >

            < props >

                < prop key = "hibernate.dialect" > org.hibernate.dialect.MySQLDialect </ prop >

                < prop key = "hibernate.show_sql" > true </ prop >

                < prop key = "hibernate.generate_statistics" > true </ prop >

                < prop key = "hibernate.connection.release_mode" > auto </ prop >

                < prop key = "hibernate.autoReconnect" > true </ prop >

            </ props >

        </ property >

    </ bean >

</ beans >